Development of Enhanced Seismic Compactness Requirements for Webs in Wide-Flange Steel Columns
Publication: Journal of Structural Engineering
Volume 147, Issue 7
Abstract
Recent full-scale testing of steel wide-flange columns under axial compression and cyclic lateral drifts for special moment frame applications showed that deep, slender columns could experience significant flexural strength degradation due to plastic hinge formation with buckling modes and considerable axial shortening within the hinge. Test results showed that the interaction between web and flange local buckling played a significant role for the observed degradation, even when the cross-sectional elements met the highly ductile limiting width-to-thickness ratios specified in the current seismic design standard for steel frames. These observations were also confirmed by numerical simulations. Enhanced limiting width-to-thickness ratios for the web of a wide-flange column for both special and intermediate steel moment frames are proposed to limit the severity of strength degradation and axial shortening.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. This includes the test data. In addition, all test videos have been posted on YouTube.
Acknowledgments
Funding for this research was provided by the Applied Technology Council under its Earthquake and Structural Engineering Research contract with the National Institute of Standards and Technology. Mr. J. O. Malley (Degenkolb Engineers) chaired the Project Advisory Committee. Mrs. A. Hortacsu (Applied Technology Council) served as the Project Manager. The authors would like to acknowledge the American Institute of Steel Construction for providing steel materials and The Herrick Corporation for providing fabrication of the test specimens.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 27, 2020
Accepted: Feb 3, 2021
Published online: Apr 29, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 29, 2021
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